Pyrethroid insecticide pollution of wetlands reduces amphipod density.

IF 2.4 4区 环境科学与生态学 Q2 ECOLOGY
Breanna R Keith, Danelle M Larson, Carl W Isaacson, Michael J Anteau, Megan J Fitzpatrick, Jake D Carleen
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引用次数: 0

Abstract

Freshwater amphipods play a key role as forage for breeding and migrating waterfowl in wetlands throughout the Prairie Pothole Region (PPR) of North America. Amphipod populations declined in recent decades, but there is a limited understanding of mechanisms for their decline and their uneven distribution across the landscape. Row crop agriculture is abundant in the PPR, but the sensitivity of amphipods and wetland ecosystems to agrochemical pollution has rarely been studied. We investigated relationships among amphipod abundances (specifically, Gammarus lacustris and Hyalella azteca), land uses, water quality, and pyrethroid insecticide contamination of wetland sediments. Our study design targeted a large gradient of amphipod abundances and accounted for water quality, hydrology, and habitat metrics that commonly influence amphipods. We found a significant, negative relationship between pyrethroid concentrations and the abundance of the two amphipod species. Pyrethroids were detected at relatively low concentrations (<2.5 ng/g sediment) in 44% of study wetlands and occurred most frequently in intensively cropped watersheds with low vegetative filter strip coverage. Interestingly, wetlands on state and federal wildlife reserves had regular occurrence of pyrethroids, demonstrating the pervasive transport of these compounds and the intensity of agriculture in the PPR. The pyrethroids are likely entering these wetlands through overland transport during rain events or aerial spray drift, and our results show that forest patches and vegetative filter strips may reduce pyrethroid exposure to both wetlands and amphipods.

淡水片脚类动物是北美草原洼地地区(PPR)湿地中繁殖和迁徙水禽的主要饲料。近几十年来,片脚类动物的数量有所减少,但人们对其减少的机制及其在整个地形中的不均匀分布了解有限。草原洼地地区盛行连作农业,但人们很少研究片脚类动物和湿地生态系统对农用化学品污染的敏感性。我们研究了片脚类动物(特别是 Gammarus lacustris 和 Hyalella azteca)的丰度、土地利用、水质和湿地沉积物中拟除虫菊酯杀虫剂污染之间的关系。我们的研究设计以片脚类动物丰度的巨大梯度为目标,并考虑了通常会影响片脚类动物的水质、水文和栖息地指标。我们发现,拟除虫菊酯浓度与两种片脚类动物的数量之间存在明显的负相关关系。检测到的拟除虫菊酯浓度相对较低 (
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来源期刊
Ecotoxicology
Ecotoxicology 环境科学-毒理学
CiteScore
5.30
自引率
3.70%
发文量
107
审稿时长
4.7 months
期刊介绍: Ecotoxicology is an international journal devoted to the publication of fundamental research on the effects of toxic chemicals on populations, communities and terrestrial, freshwater and marine ecosystems. It aims to elucidate mechanisms and processes whereby chemicals exert their effects on ecosystems and the impact caused at the population or community level. The journal is not biased with respect to taxon or biome, and papers that indicate possible new approaches to regulation and control of toxic chemicals and those aiding in formulating ways of conserving threatened species are particularly welcome. Studies on individuals should demonstrate linkage to population effects in clear and quantitative ways. Laboratory studies must show a clear linkage to specific field situations. The journal includes not only original research papers but technical notes and review articles, both invited and submitted. A strong, broadly based editorial board ensures as wide an international coverage as possible.
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